20-8-2009 :chemistry

1) Aspirin is a pain killer with pKa=2. 2 tablets each containing 0.09 gm of aspirin are dissolved in 100ml solution. Resultant pH = -----------

2)if rain water consists of 2.463 lt of dissolved SO3 in 1 litre of water at a partial pressure of 2 atm , then pH of the solution is --------

3) pH of 0.01 M aquesous soln of Na2SO3 is ---------

2 Answers

(1) strength of aspirin (weak acid) = 0.09 * 2 g/100ml = 1.8 g/l = 1.8 /180 moles/l =0.01M

thus , pH(weak acid) = 1/2[pK_A -log C] =2

answer to the 3rd one?

√ √ || {} [] () → ~ ^ x x x → → ln log lg lim lim cos sin tan cot arcsin arccos arctan

∫ ∫ ∫ ∫ ∫ ∬ ∬ ∬ ∬ ∬ ∭ ∭ ∭ ∭ ∭ ⨌ ⨌ ⨌ ⨌ ⨌

∑ ∑ ∑ ∑ ∑ ∮ ∮ ∮ ∮ ∮ ∏ ∏ ∏ ∏ ∏ ∐ ∐ ∐ ∐ ∐

+ - × ÷ ± ∓ = ∪ ∩ ≠ ∼ ≈ ∅ ∀ ∃ ∈ ∋ ∝ ≤ ≥ ≃ ≅ ≡ < > ≪ ≫ ⊂ ∉ ⊃ ⊆ ⊇ ⇒ ⇐ ⇔ ⇒ ⇐ ⇔ ⇑ ⇓ ⇕ → ← ↔ → ← ↔ ↑ ↓ ↕ ↖ ↗ ↘ ↙ ↪ ↩ ⇀ ↼ ⇁ ↽

° ∂ ∞ α β γ δ θ λ μ ν ξ π ρ σ φ ω ε ƒ κ τ υ Γ Δ Λ Σ Π Ω